package lab02.test30;

import java.util.List;
import java.util.Scanner;

/**
 * Created by MECHREV on 2017/11/6.
 */
public class Test {
    public static void main(String[] args) {
        Scanner scanner= new Scanner(System.in);
        Double socre1;
        Double socre2;
        Double socre3;
        Double avarage;
        socre1=scanner.nextDouble();
        socre2=scanner.nextDouble();
        socre3=scanner.nextDouble();
        avarage=(socre1+socre2+socre3)/3;
        System.out.println(avarage);
    }
}
